Earthfault Protection System

EPSY (Earthfault Protection earth fault protection system from Trench Austria, designed networks. Compared with other methods of power system earthing, earth fault com- pensation offers major ad- sonnel, the security of supply quential damage during earth However, compared to alter- native earthing methods, earth fault compensation demands tecting and locating earth faults. These standards are met by Trench Austria's EPSY system. On the other hand, devices and systems of traditional earth fault protection engineering can not meet these stringent The protection system EPSY adjustable type), -...

Earthfault Compensation Controller EFC50 / EFC50Ì Fig.l Earthfault Compensation Controller EFC'50 The Earthfault Compensation Controller EFC50 determines the resonance point by Fig. 2 Earthfault Compensation Controller EFC50i with 19"-rack mounted Current Injection Device ECI The Earthfault Compensation Controller EFC50Ì uses a current injection into the zero-sequence system for determination of the resonance point. Therefore a detuning of the Arc Suppression Coil is no longer necessary for the calculation procedure. The operation mode EFC50Ì requires the installation of the current injection...

Earthfault Detection Device EFD500 / EFD500c When an earth fault occurs in a mediate problem faced by the utility is how to reliable detect which feeder is the faulty one. It is well known that traditional earth fault relays cannot relia- ble locate the faulty feeder for both high and low impedance faults. There are fundamental reasons for this, which include rors, the small zero-sequence currents involved, but most of all because they measure sig- nals from only one feeder to which they are connected. proach, the signals that are readily available for earth fault of all those feeders that are...

• microprocessor based • easy operation by means function keys • flexible hardware • serial interfaces • analogue output module external indication of several measurement signals • prepared for easy upgrade to with additional control suppression coil Hardware Options • alternative power supply • optical port for serial Fig. 3 Compact Device EFD500c (control & detection)

- integrated display - scroll wheel - clearly arranged function keys • clear menu guide with „help" - text control and detection mode • automatic, adaptive activated software options • terminal program EFDTerm setting and on-site operating • remote control by means Fig. 4 Operating panel of compact device EFD500c

Software Options • easy upgrade from status via text messages • measurement buffer network incidents • remote parameter changes • 3 menu access levels for different users serial interface or Ethernet • automatic reclosing unit faulty feeders for self-healing • fault location evaluation of fault location In case of a solid earth fault hardware modul) • software options for the earth fault compensation control function in the compact device

Basic device digital outputs potential free contacts, 230 V AC/DC, max 5 A continuous 20 ... 1203 2 0 ... 120 max contact current closing rating 1000 VA max contact interrupting rating 30 VA auxiliary voltage (other voltages upon request) 1 current inputs assignable via menu for zero sequence current measurement resp. for current injection (max. 3 pes.) 2 depending on the system configuration; in steps of 20

Basic device Software options Mechanical data

Current Injection Device ECI The Current Injection Device differential measurement values by means of an current injection into the zerosequence system. This approach is used The current injection into the zero-sequence system is usually done via a suitable power suppression coil. The Current Injection Device current limiting, relays, control- Following designs are availabl outdoor design existing cubicle Fig. 6 ECI in conventional design (indoor design, Fig' 7 ECI 19"-rack mounted outdoor design and design on mounting plate available )

Examples for System Configurations Single-busbar configuration

Fig. 11 Control and detection EFD500c at single-busbar configuration

Double-busbar configuration Fig. 12 Fig. 13 14 EFC50i at double-busbar configuration EFD500 at double-busbar configuration

Fig. 14 Control and detection EFD500c at double-busbar configuration

Trench Austria GmbH email [email protected] Trench Brasil LTDA Contagem, Minas Gerais/Brasil email [email protected] Subject to change without notice Trench China Limited 3658 Jiang Cheng Road email [email protected] email [email protected] Trench Germany GmbH email [email protected] email [email protected] Trench Limited Coil Product Division 71 Maybrook Drive, Scarborough email [email protected] Trench Limited Instrument Transformer Division 390 Midwest Road, Scarborough email [email protected] email [email protected] South Drive...